Removing low poly cylinders edges?
I think you are trying to Say, 'How to remove Flat Edges'.
If you want Low poly But smooth Cylinder then;


Select The Cylinder &amp; In Tool Shelf Click 'Smooth'



(It's A low-poly cylinder with only 24 Faces on curved Surface.)




Go to Modifiers Tab Add Edge Split Modifier To get the Caps Splited Rest of the Cylinder. This wont Split The Faces on Curved Surface. Because They Are Attached with a higher angle although you can split them in some cases by increasing the Angle of Edge Split Modifier. But I think 30 Degree will work.




You Will get Smooth Cylinder with this.